TDOT Environmental Mitigation Credits

The Tennessee Department of Transportation (TDOT) selected RES to provide environmental mitigation credits to offset unavoidable environmental impacts due to roadway projects across Tennessee. RES was awarded three sites, resulting in a total of 68,593 linear feet of stream restoration, enhancement, and preservation.

For each, RES is responsible for site selection, land acquisition, survey, design, permitting, construction, monitoring, and adaptive management to support the TDOT’s restoration goals. RES is performing restoration efforts in multiple locations across the state including the Chattanooga, Knoxville, and Memphis area. Environmental feasibility services provided by RES included delineation of wetlands and streams on the site subject to jurisdiction by the US Army Corps of Engineers (USACE) under Section 404 of the Clean Water Act. RES utilized the currently accepted 1987 Corps of Engineers Wetlands Delineation Manual, and appropriate Regional Supplement, to delineate and flag potentially jurisdictional areas on-site, as well as collect all necessary data. Stream construction tasks will consist of mobilization, erosion and sediment control installation, clearing and grubbing, maintenance of stream flow, rock/log structure installation, riffle grade control installation, bank stabilization matting, seeding, and planting.

The overall goal of the Bank is to restore, to the greatest extent possible, the ecological function of the highly degraded aquatic resources with each of the sites. A primary objective of achieving this goal will be to generate stream compensation credits that fully mitigate authorized losses of streams, which are waters of the U.S. (WOUS), in a manner that best contributes to the long-term ecological health of the watershed. The Bank will accomplish this objective through the implementation of various mitigation measures, including stream re-establishment, restoration, enhancement, and riparian buffer planting. These activities are intended to produce watershed-scale improvements of ecological services that will replace the chemical, physical, and biological function of stream channels and riparian areas within the proposed service area lost as a result of authorized impacts.